He told Now: "Selena's one of the classiest girls I've ever met and I love class in girls. She's a superstar.

"She's very busy and [Union J are] just starting out."

Speaking of a budding romance between the two, he said: "It's a tough situation. But she's very lovely."

When asked about spending time with the singer in Portugal, he said: "We just chatted, all of us were there. It was lovely of her to invite us back to her place, but it was a private thing. We were a bit shocked it got into the papers."